otometrics Madsen AccuScreen PRO, Руководство пользователя

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GN Otometrics A/S 19
AccuScreen PRO User Manual Test Methods
2.2.2 Advantages of combined OAE/ABR-Screening
The AccuScreen PRO provides a feature for setting the stimulus lev-
el at either 35 or 45 dB nHL. This means that it is either 35 or 45 dB
above the normal hearing threshold of a healthy individual.
The spectrum of the stimulus includes all frequencies between 500
and 4000 Hz, but due to filtering in the ear canal and other influenc-
es, the main region tested is between 2000 and 4000 Hz. Most signif-
icant hearing losses can be found in this region.
As compared to the testing of otoacoustic emissions, the ABR dis-
criminates more precisely between mild and moderate hearing loss-
es. Consequently, its specificity for detecting moderate losses is
higher. However, the test requires more time for preparation and
testing than an OAE test. Automated ABR tests are therefore ideal as
a second step following an OAE screening test with a
REFER result,
as well as screening children who are at greater risk for retrocochlear
hearing loss.
2.3 The different versions of the AccuScreen PRO
The AccuScreen PRO is available as a single-step or multi-step hear-
ing screener. You can choose between the following test methods:
AccuScreen PRO T> TEOAE
AccuScreen PRO D> DPOAE
AccuScreen PRO A> ABR
AccuScreen PRO TD> TEOAE and DPOAE
AccuScreen PRO TA> TEOAE and ABR
AccuScreen PRO DA> DPOAE and ABR
AccuScreen PRO TDA> TEOAE, DPOAE and ABR